He said Ms Moyes had gathered a loyal band of college friends, who were left reeling at her death.
Support and counselling had been offered to students in need.
"Tegan was bubbly and vibrant and she knew her own mind. She kept to herself but had a small circle of friends and was a supportive and loyal friend to that group."
Ucol Wairarapa campus manager Angela Hewitt said the tragic death of Ms Moyes, who was newly enrolled on a hairdressing course, had quickly reverberated throughout the small campus community.
"She had had her first week here and was enjoying it. We have a small family here and the campus has been affected in a number of ways."
Ms Hewitt said the older student involved in the crash had been on a different programme to Ms Moyes.
The death of Ms Moyes comes a week after 15-year-old Carterton schoolgirl Grace Diedrichs was killed when she was thrown from a car that collided with a passenger train at the Wiltons Rd level crossing.
A funeral service for Ms Moyes is to be held at the Richmond Chapel in Carterton at 11am on Thursday.